package com.example.yangyang.spinnertest_125yy;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
private TextView tvinfo;
    private Spinner spinner;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //定义数据源
        String[] cities={"北京","上海","大连","天津"};
        //定义适配器
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(
            this,//上下文
            android.R.layout.simple_spinner_item,
            cities//数据源
        );
        //设置Spinner下拉按钮样式
        adapter.setDropDownViewResource(
             android.R.layout.simple_spinner_dropdown_item
        );//Spinner与Adapter绑定———4
        spinner.setAdapter(adapter);
        //Spinner点击条目事件--5

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                tvinfo.setText("您选择的是："+
                        parent.getItemAtPosition(position).toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

        spinner.setPrompt("请选择城市");//本句为Spi nner是对话框形式而设的标题

    }
private void init(){
    tvinfo=(TextView)findViewById(R.id.textview);
    spinner=(Spinner)findViewById(R.id.spinner);

}

}
